8207266: ThreadMXBean::getThreadAllocatedBytes() can be quicker for self thread
Summary: Add com.sun.management.getCurrentThreadAllocatedBytes, implement getThreadAllocatedBytes(long) independent of getThreadAllocatedBytes(long[])
Reviewed-by: mchung, dholmes, sspitsyn
8228460: bootstrap class path not set in conjunction with -source 11
Summary: Ensuring implicit system module path is checked for the no-bootclasspath warning for -source >= 9.
Reviewed-by: vromero